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EP1029404B1 - Procede et dispositif de transmission de donnees dans un systeme de communication numerique avec arq - Google Patents

Procede et dispositif de transmission de donnees dans un systeme de communication numerique avec arq Download PDF

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Publication number
EP1029404B1
EP1029404B1 EP98961025A EP98961025A EP1029404B1 EP 1029404 B1 EP1029404 B1 EP 1029404B1 EP 98961025 A EP98961025 A EP 98961025A EP 98961025 A EP98961025 A EP 98961025A EP 1029404 B1 EP1029404 B1 EP 1029404B1
Authority
EP
European Patent Office
Prior art keywords
data
equalizer
decoder
data frame
information
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP98961025A
Other languages
German (de)
English (en)
Other versions
EP1029404A1 (fr
Inventor
Volker Franz
Dieter Emmer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1029404A1 publication Critical patent/EP1029404A1/fr
Application granted granted Critical
Publication of EP1029404B1 publication Critical patent/EP1029404B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1829—Arrangements specially adapted for the receiver end
    • H04L1/1835—Buffer management
    • H04L1/1845—Combining techniques, e.g. code combining
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L1/00—Arrangements for detecting or preventing errors in the information received
    • H04L1/12—Arrangements for detecting or preventing errors in the information received by using return channel
    • H04L1/16—Arrangements for detecting or preventing errors in the information received by using return channel in which the return channel carries supervisory signals, e.g. repetition request signals
    • H04L1/18—Automatic repetition systems, e.g. Van Duuren systems
    • H04L1/1812—Hybrid protocols; Hybrid automatic repeat request [HARQ]

Definitions

  • the invention relates to a method for packet-oriented Data transmission in a digital transmission system, at an ARQ protocol and channel coding to minimize errors with encoders and decoders that have a soft information to evaluate retransmitted data frames submit, is applied, and an arrangement according to the preamble of claim 8.
  • the data from a Data source summarized in blocks and a convolutional encoder fed.
  • ISI Intersymbol interference
  • the equalized Data blocks processed in a deinterleaver, and this passes the data blocks to a decoder after deinterleaving which then corrects most of the errors and passes its output signals to the data sink.
  • channel coding is used tried to influence the errors that occurred during the transfer in the ISI channel to correct.
  • bit rate is increased, and all incoming information are subjected to channel coding.
  • Different coding methods are used for data transmission used as for speech coding.
  • FEC Forward Error Correction
  • the Error correction come the error forward correction (FEC: Forward Error Correction) of the physical layer and the Error correction with the ARQ protocol for layer 2 in question, the corresponding to transparent or non-transparent Lead transmission class.
  • FEC Forward Error Correction
  • ARQ Automatic Request for retransmission
  • targeted troubleshooting is carried out for data transmission.
  • the ARQ process at the The basis of the flow control leads to a non-transparent Transmission and is particularly effective in combination with FEC.
  • the receiver combined packets with noise signals to a packet with to obtain a code rate that is low enough so that a reliable combination is possible even with channels that have extremely high error rates. It is tried by Combining a minimum number of packets the code rate and minimize the delay that is required is to decode a given packet (data frame). This is the classic process of Code combinations that need to be improved. become diversity methods, for example metric combining applied.
  • the invention is based on the object Method and device for data transmission in one specify digital transmission system for packet-switched service, the effort involved in processing renewed Transmission of data frames within the framework of an ARQ protocol reduced and the error correction improved.
  • the data frame that is retransmitted according to the ARQ protocol is, if it has been channel encoded, has already been decoded Service.
  • decoding a-posteriori and extrinsic probabilities for the coded bits are obtained.
  • the extrinsic or a posteriori probabilities can serve as a priori information or probabilities be used at the reception.
  • the Channel decoder and the ARQ protocol a priori information won, and the recipient processes the additional Information together with the retransmitted data frame in a progressive manner.
  • the ARQ protocols can provide information that the Decoder has generated in the equalization of the retransmitted Data frames can be used as a priori information even if a metric Combining according to the prior art because of more characteristic Properties of the structures is not possible.
  • the procedure alternates in progressive and performed in a backward-going manner.
  • the procedure is repeated until no retransmission requested under the ARQ protocol becomes.
  • the number of repetitions in the transmission of a data frame to limit, in an advantageous embodiment of the inventive method according to a predetermined Number of repeated transmissions of the data frame canceled.
  • the soft information is optionally available in the Equalizer processed by directing the "soft" information in which algorithm is used. This procedure has in practice when combining transmitted data frames proven and is therefore also in the present invention advantageous.
  • DE 42 24 214 C2 describes a method for source-controlled Channel decoding by expanding the Viterbi algorithm known, with the preference of certain information bits a number of states, for example states of data bits raised or lowered by a metric surcharge about what a priori or a posteriori information is present. This is the a-priori or a-posteriori information used directly in the algorithm. To the solution of problems with the transmission with ARQ protocol this known patent does not make a significant contribution.
  • Procedure is based on the information at the exit the decoder only extrinsic or a posteriori information used for further processing, with a satisfactory Result with less effort in combining the signals are reached.
  • the method according to the invention is particularly advantageous if it is applied to the GSM system with RLP protocol becomes.
  • the invention is not based on the Use in the GSM system is limited, but is in this Context particularly advantageous.
  • Figure 1 shows a conventional transmission path for the transmission and reception of digital data.
  • the data are supplied from a data source 2 in the form of bits. These bits are combined in blocks to form u i and fed to an encoder which supplies coded blocks c i .
  • the coded data blocks c i are scrambled in an interleaver 6.
  • the data blocks are then transmitted after interleaving via an ISI channel 8 and equalized in an equalizer 10.
  • the equalizer 10 After the equalizer 10 has eliminated the interference, it delivers equalized data blocks to a deinterleaver 12, which, after deinterleaving, delivers the data blocks to a decoder 14, which then corrects the majority of the errors and forwards its output signals to a data sink 16.
  • This is the transmission and reception scheme to which the invention relates with the a priori information acquisition and processing.
  • FIG. 2 shows the case according to the prior art, in which a data frame is transmitted twice as part of an ARQ protocol.
  • the data frame y (1) sent first is fed to the equalizer 10 (1) and from there via the deinterleaver 12 (1) to a combiner 18.
  • the signal y (2) of the data frame in the second transmission is sent to the equalizer 10 (2 ) and from there it also reaches the combiner 18 via the deinterleaver 12 (2), where the two signals are combined.
  • the output of the combiner 18 passes through the decoder 14 to the data sink as block û i .
  • a device that works according to DE 42 24 214 C2 or that combines with a “symbol-by-symbol” MAP algorithm is suitable as a combiner.
  • the signal y (1) is fed to the equalizer 10 (1), from there to the deinterleaver 12 (1) and the decoder 14 (1).
  • the signal at the output of the decoder 14 (1) with its "soft” or “hard” information is discarded in this example, which is indicated by the arrow, so that the ARQ protocol retransmits the data frame as signal y (2) is required to be supplied to the equalizer 10 (2).
  • the equalizer 10 (2) is supplied with the information present at the output of the decoder 14 (1) in accordance with the coded bits via an interleaver 20.
  • the equalizer 10 (2) processes the two signals and outputs its output signal to the deinterleaver 12 (2), which delivers the signals via the decoder 14 (2) to the data sink 16 for the signals û i .
  • the interleaver serves 20, which are present at the output of the decoder 14 (1) Information to the input of the equalizer 10 (2) as a priori To give information.
  • Figure 3 is that from the decoder 14 (1) to the equalizer 10 (2) given information the information that the encoded bits, with the "soft" information that is called the extrinsic or a-posteriori information of the equalizer 10 (2) after deinterleaving and decoding to the Data sink 16 is given where the signal is accepted and the ARQ is ended.
  • the data block must be transmitted again.
  • the scheme shown above can then be multiplied that the retransmissions carried out as long until the decoded data blocks are accepted or the ARQ protocol after a predetermined number of renewed Transfers aborts.
  • FIG 4. A case for multiple retransmission of a data block according to the ARQ protocol is shown in Figure 4. at In this embodiment, the signal y (1), which is the corresponds to the first transmission of the data frame, via the equalizer 10 (1), deinterleaver 12 (1) and decoder 14 (1) processed and discarded, which is indicated by the arrow is.
  • the signal y (2) which is the second transmission of the Data frame corresponds, is together with the output signal of the decoder 14 (1), which via the interleaver 20 (1) is supplied to the equalizer 10 (2), processed and over further processes the deinterleaver 22 (2), the decoder 14 (2) and discarded.
  • Signal y (N) which is the Nth transmission of the data frame corresponds and after its processing together with the output signal of the preceding decoder, which as a-priori Information is supplied to the equalizer 10 (N) processed and via the deinterleaver 12 (N), the decoder 14 (N) arrives at the data sink 16 after the output signal of the Encoder 14 (N) has been accepted.
  • the decoder 14 (N) arrives at the data sink 16 after the output signal of the Encoder 14 (N) has been accepted.
  • this embodiment is always the signal of the retransmitted Data frame with the information at the exit of the previous one Decoders processed what is more or less advancing Processing corresponds.
  • a corresponding interleaver can then also be between the Decoder 14 (3) and equalizer 10 (2) and between the Decoder 14 (N) and equalizer 10 (N-1) are provided his. It is both a forward and one backward processing possible in which the signals at the output of the decoder either to one of the following Equalizer or one of the previous equalizers supplied becomes.
  • the information of the decoder via the interleaver 22 14 (n) used as a priori information in the equalizer 10 (1) becomes.
  • the forward processing can be repeated. An abort is also after a fixed number of repetitions forward processing possible.
  • the invention is not based on the exemplary embodiments shown limited.
  • the forward one Processing and also backward processing in that the output signals of a particular Decoder to any of the preceding or following Processing can be used.

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Signal Processing (AREA)
  • Detection And Prevention Of Errors In Transmission (AREA)
  • Error Detection And Correction (AREA)

Claims (9)

  1. Procédé pour la transmission de données orientée paquets dans un système de transmission numérique, dans lequel :
    les données à transmettre au cadre de données sont recueillies, codées, envoyées, reçues et décodées,
    un protocole ARQ prévoit une nouvelle transmission d'un deuxième cadre de données identique, en cas d'échec d'une première tentative pour décoder les données dans un premier cadre de données,
    des décodeurs (14) créent une information logicielle en plus des données à décoder d'un cadre de données transmis, caractérisé en ce que
    une information logicielle extraite pendant la première tentative de décodage préalable est utilisable comme information a priori pour l'exploitation du deuxième cadre de données, et une information logicielle extraite pendant la seconde tentative de décodage ultérieure est utilisée comme information a priori pour l'exploitation du premier cadre de données.
  2. Procédé selon la revendication 1, caractérisé en ce que le procédé est exécuté alternativement dans une façon de procéder vers l'avant et dans une façon de procéder vers l'arrière.
  3. Procédé selon la revendication 1 ou 2, caractérisé en ce que le procédé est répété jusqu'à ce qu'aucune nouvelle transmission ne soit demandée dans le cadre du protocole ARQ.
  4. Procédé selon l'une des revendications 1 à 3, caractérisé en ce que le procédé est interrompu après un nombre prédéfini d'émissions répétées du cadre de données.
  5. Procédé selon l'une des revendications 1 à 4, caractérisé en ce que l'information a priori est traitée dans un égaliseur (10) par un algorithme MAP « symbole après symbole ».
  6. Procédé selon l'une des revendications 1 à 5, caractérisé en ce que seule l'information extrinsèque de l'information à la sortie du décodeur (14) est utilisée pour un traitement ultérieur.
  7. Procédé selon l'une des revendications 1 à 6, caractérisé en ce qu'il est appliqué avec un protocole de liaison hertzienne dans un système GSM.
  8. Dispositif pour l'exécution d'un procédé selon la revendication 1 avec
    un codeur (4) attribué à une source de données (2),
    un premier entrelaceur (6) placé en aval du codeur (4),
    un égaliseur (10) raccordé au premier entrelaceur (6) à l'aide d'un canal (8),
    un désentrelaceur (12) placé entre l'égaliseur (10) et un décodeur (14), le décodeur (14) présentant une sortie sur laquelle une information logicielle est disponible,
       caractérisé en ce qu'un deuxième entrelaceur (20) est placé entre la sortie du décodeur (14) sur laquelle l'information logicielle est disponible et l'une des entrées de l'égaliseur (10), et en ce qu'un dispositif de commande donnant l'information logicielle à l'égaliseur (10) est couplé au deuxième entrelaceur (20), et
    en ce que l'information logicielle extraite lors du décodage du cadre de données (n+1) selon le procédé conforme à l'invention est traitée avec un ou plusieurs des cadres de données (1 à n) dans une façon de procéder vers l'arrière.
  9. Dispositif selon la revendication 8, caractérisé en ce que le dispositif de commande est couplé à un décodeur (14) n (n = 1...N et N = le nombre de cadres de données envoyé dans le cadre du protocole ARQ) et soit à un égaliseur (10) n+1 soit à l'un des égaliseurs (10) 1 à n-1.
EP98961025A 1997-11-06 1998-10-20 Procede et dispositif de transmission de donnees dans un systeme de communication numerique avec arq Expired - Lifetime EP1029404B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19749148 1997-11-06
DE19749148A DE19749148C2 (de) 1997-11-06 1997-11-06 Verfahren und Einrichtung zur Datenübertragung in einem digitalen Übertragungssystem mit ARQ
PCT/DE1998/003069 WO1999025089A1 (fr) 1997-11-06 1998-10-20 Procede et dispositif de transmission de donnees dans un systeme de communication numerique avec arq

Publications (2)

Publication Number Publication Date
EP1029404A1 EP1029404A1 (fr) 2000-08-23
EP1029404B1 true EP1029404B1 (fr) 2002-08-28

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Application Number Title Priority Date Filing Date
EP98961025A Expired - Lifetime EP1029404B1 (fr) 1997-11-06 1998-10-20 Procede et dispositif de transmission de donnees dans un systeme de communication numerique avec arq

Country Status (6)

Country Link
US (1) US6222835B1 (fr)
EP (1) EP1029404B1 (fr)
JP (1) JP3381847B2 (fr)
AU (1) AU1661099A (fr)
DE (2) DE19749148C2 (fr)
WO (1) WO1999025089A1 (fr)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1085661B1 (fr) * 1999-09-14 2005-03-02 Lucent Technologies Inc. Décodeur de canal et procédé de décodage de canal
US20010052104A1 (en) * 2000-04-20 2001-12-13 Motorola, Inc. Iteration terminating using quality index criteria of turbo codes
FR2809249B1 (fr) * 2000-05-16 2004-04-23 France Telecom Procede et systeme de detection et de decodage iteratif de symboles recus, couple a une reestimation des coefficients du canal de transmission
US7251767B2 (en) * 2000-07-31 2007-07-31 Siemens Aktiengesellschaft Method for correcting errors in a packet-oriented data transmission
US20020172294A1 (en) * 2001-04-02 2002-11-21 Jung-Fu Cheng Methods and systems for selective interleaving in retransmissions and iterative demodulation of modulated signals with different interleaving
DE10296698B4 (de) * 2001-04-24 2007-07-12 Intel Corporation, Santa Clara Verfahren und Vorrichtung zum Kodieren und Dekodieren von Daten mit unterschiedlichen Modulationsschemata und Kodierungen und einem ARQ-Protokoll
US7154936B2 (en) * 2001-12-03 2006-12-26 Qualcomm, Incorporated Iterative detection and decoding for a MIMO-OFDM system
GB2408898B (en) * 2003-12-02 2006-08-16 Toshiba Res Europ Ltd Improved communications apparatus and methods
KR101678404B1 (ko) * 2010-02-25 2016-11-23 삼성전자주식회사 사전 확률 정보를 사용하는 메모리 시스템 및 그것의 데이터 처리 방법
US9485061B2 (en) * 2012-10-12 2016-11-01 Samsung Electronics Co., Ltd. Communication system with flexible repeat-response mechanism and method of operation thereof
US10265068B2 (en) 2015-12-30 2019-04-23 Ethicon Llc Surgical instruments with separable motors and motor control circuits

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8628821D0 (en) * 1986-12-02 1987-01-07 Plessey Co Plc Data transmission systems
DE4224214C2 (de) * 1992-07-22 1995-02-09 Deutsche Forsch Luft Raumfahrt Verfahren zur quellengesteuerten Kanaldecodierung durch Erweiterung des Viterbi-Algorithmus
FR2730370B1 (fr) * 1995-02-07 1997-04-25 France Telecom Dispositif de reception de signaux numeriques a structure iterative, module et procede correspondants
US5983382A (en) * 1996-12-31 1999-11-09 Lucent Technologies, Inc. Automatic retransmission query (ARQ) with inner code for generating multiple provisional decodings of a data packet
US5954839A (en) * 1997-01-14 1999-09-21 Samsung Electronics Co., Ltd. Error protection method for multimedia data

Also Published As

Publication number Publication date
AU1661099A (en) 1999-05-31
JP3381847B2 (ja) 2003-03-04
DE19749148C2 (de) 1999-12-02
WO1999025089A1 (fr) 1999-05-20
EP1029404A1 (fr) 2000-08-23
JP2001523066A (ja) 2001-11-20
DE19749148A1 (de) 1999-06-24
DE59805346D1 (de) 2002-10-02
US6222835B1 (en) 2001-04-24

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